ZIP Code 20659

20659 is one of Maryland's ZIP codes, delivering to addresses in Mechanicsville, St. Mary's County.

City: Mechanicsville
County: St. Mary's County
State: Maryland
Prefix: 206xx

Where this code sits

20659 is part of the 206xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mechanicsville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20659 delivers to without sharing its boundary.

ZIP codes nearest 20659

The ZIP codes whose reference points sit closest to 20659.
ZIP code	Distance	Delivers to
ZIP code 20660	4.1 mi	Morganza, MD
ZIP code 20622	5.3 mi	Charlotte Hall, MD
ZIP code 20656	5.3 mi	Loveville, MD
ZIP code 20612	6.1 mi	Benedict, MD
ZIP code 20624	6.1 mi	Clements, MD
ZIP code 20621	6.3 mi	Chaptico, MD
ZIP code 20637	7.0 mi	Hughesville, MD
ZIP code 20610	8.9 mi	Barstow, MD

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 20659, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 20659. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.